handle Manage_subdevs() for 'external' arrays

From: Dan Williams <dan.j.williams@intel.com>

1/ Block attempts to add/remove devices from container members
2/ Forward add/remove requests to containers

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/msg.h b/msg.h
new file mode 100644
index 00000000..84ee9b3a
--- /dev/null
+++ b/msg.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2008 Intel Corporation
+ *
+ * 	mdmon socket / message handling
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+struct mdinfo;
+struct md_message {
+	int seq;
+	int num_bytes;
+	void *buf;
+};
+
+enum md_message_action {
+	md_action_ping_monitor,
+	md_action_remove_device,
+};
+
+struct md_generic_cmd {
+	enum md_message_action action;
+};
+
+struct md_remove_device_cmd {
+	enum md_message_action action;
+	dev_t rdev;
+};
+
+/* union of all known command types, used to sanity check ->num_bytes
+ * on the receive path
+ */
+union md_message_commands {
+	struct md_generic_cmd generic;
+	struct md_remove_device_cmd remove;
+};
+
+extern const int start_magic;
+extern const int end_magic;
+
+extern int receive_message(int fd, struct md_message *msg, int tmo);
+extern int send_message(int fd, struct md_message *msg, int tmo);
+extern int ack(int fd, int seq, int tmo);
+extern int nack(int fd, int err, int tmo);
+extern int connect_monitor(char *devname);
+extern int ping_monitor(char *devname);
+extern int send_remove_device(int fd, dev_t rdev, int seq, int tmo);
+